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Investments (Tables) - Southern California Edison
 9 Months Ended
Sep. 30, 2017
Investment [Line Items]  
Amortized Cost and Fair Value of the Trust Investments
The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion of fair value of the trust investments):
 
Longest
Maturity
Dates
 
Amortized Cost
 
Fair Value
(in millions)
 
September 30,
2017
 
December 31,
2016
 
September 30,
2017
 
December 31, 2016
Stocks
—
 
$
290

 
$
319

 
$
1,655

 
$
1,547

Municipal bonds
2054
 
612

 
659

 
738

 
766

U.S. government and agency securities
2067
 
1,220

 
1,131

 
1,298

 
1,191

Corporate bonds
2057
 
545

 
600

 
609

 
659

Short-term investments and receivables/payables1
One-year
 
111

 
75

 
115

 
79

Total
 
 
$
2,778

 
$
2,784

 
$
4,415

 
$
4,242


1
Short-term investments include $114 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2017 as of December 31, 2016. No repurchase agreements were held as of September 30, 2017.
Summary of Changes in the Fair Value of Trust
The following table sets forth a summary of changes in the fair value of the trust:
 
 
Three months ended September 30,
 
Nine months ended September 30,
(in millions)
 
2017
 
2016
 
2017
 
2016
Balance at beginning of period
 
$
4,381

 
$
4,344

 
$
4,242

 
$
4,331

Gross realized gains
 
22

 
18

 
134

 
61

Gross realized losses
 
(3
)
 
(1
)
 
(19
)
 
(5
)
Unrealized gains, net of losses
 
65

 
32

 
179

 
153

Other-than-temporary impairments
 
(2
)
 
(2
)
 
(6
)
 
(10
)
Interest and dividends
 
28

 
28

 
87

 
88

Income taxes
 
(9
)
 
(5
)
 
(35
)
 
(47
)
Decommissioning disbursements
 
(65
)
 
(38
)
 
(164
)
 
(192
)
Administrative expenses and other
 
(2
)
 
—

 
(3
)
 
(3
)
Balance at end of period
 
$
4,415

 
$
4,376

 
$
4,415

 
$
4,376